<template>
  <div id="app">
    <ul v-for="(item, index) in myArr" :key="index">
      <li>{{ item }}</li>
    </ul>
    <button @click="random">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr: ["帅哥", "美女", "程序猿"],
    };
  },
  methods:{
    random(){
      const arr=this.myArr[0]
      this.myArr.splice(0,1)
      this.myArr.push(arr)
    }
  }
};
</script>